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arXiv 2407.04523cond-mat.mtrl-sci
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多者不同:移动离子提升钙钛矿太阳能电池的设计容差

More is Different: Mobile Ions Improve the Design Tolerances of Perovskite Solar Cells

Lucy J. F. Hart, Fraser J. Angus, Yin Li, Abdul Khaleed, James R. Durrant, Aleksandra Djurišić, Pablo Docampo, Piers R. F. Barnes

AI总结:

本文揭示钙钛矿太阳能电池中移动离子的静电重新分布可降低表面复合电流,从而提升光电压并增强对界面能量偏移的容差,进而修正传统光伏设计原则。

摘要:

金属卤化物钙钛矿太阳能电池(PSC)性能的许多近期进展被归因于表面处理,这些处理钝化界面陷阱态、最小化电荷复合并提升光电压。令人惊讶的是,这些光电压超过了电池的内建电势,且通常报道钙钛矿与传输层半导体带边之间存在较大的能量偏移——这与标准光伏设计原则相矛盾。在此我们表明,这种对能量偏移的容差源于钙钛矿层中的混合离子/电子导电。结合漂移-扩散模拟与探测PSC电流-电压性能随离子分布变化的实验,我们证明离子电荷的静电重新分布在稳态下降低了表面复合电流,将光电压提高了数十至数百毫伏。因此,移动离子可以降低光电压对钙钛矿/传输层界面能量失配的敏感性,从而有利于整体效率。基于这些见解,我们展示了如何修改光伏设计原则以考虑移动离子。

英文摘要:

Many recent advances in metal halide perovskite solar cell (PSC) performance are attributed to surface treatments which passivate interfacial trap states, minimise charge recombination and boost photovoltages. Surprisingly, these photovoltages exceed the cells' built-in potentials, often with large energetic offsets reported between the perovskite and transport layer semiconductor band edges - contradicting standard photovoltaic design principles. Here we show that this tolerance to energetic offsets results from mixed ionic/electronic conduction in the perovskite layer. Combining drift-diffusion simulations with experiments probing the current-voltage performance of PSCs as a function of ion distribution, we demonstrate that electrostatic redistribution of ionic charge reduces surface recombination currents at steady-state, increasing the photovoltage by tens to hundreds of millivolts. Thus, mobile ions can reduce the sensitivity of photovoltage to energetic misalignments at perovskite/transport layer interfaces, benefitting overall efficiency. Building on these insights, we show how photovoltaic design principles are modified to account for mobile ions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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